diff --git a/testdata/ffmpeg.d/cmd/prune/main.go b/testdata/ffmpeg.d/cmd/prune/main.go
index 482a500..0516835 100644
--- a/testdata/ffmpeg.d/cmd/prune/main.go
+++ b/testdata/ffmpeg.d/cmd/prune/main.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"log"
 	"math/big"
 	"os"
 	"os/exec"
@@ -66,6 +67,7 @@ func Run(ctx context.Context, args []string) error {
 				if seriesHasMovement, err := seriesHasMovement(ctx, seriesFiles, movementInterval); err != nil {
 					return err
 				} else if seriesHasMovement {
+					log.Println("found movement in", series)
 					outd := strings.ReplaceAll(cam, "record", "movement")
 					os.MkdirAll(outd, os.ModePerm)
 					cmd := exec.CommandContext(ctx,
@@ -80,6 +82,8 @@ func Run(ctx context.Context, args []string) error {
 					if out, err := cmd.CombinedOutput(); err != nil {
 						return fmt.Errorf("failed to persist series %s: (%w) %s", series, err, out)
 					}
+				} else {
+					log.Println("no movement in", series)
 				}
 				for _, seriesFile := range seriesFiles {
 					if err := os.Remove(seriesFile); err != nil {